# US 5,708,726 A · Taut armature resonant impulse transducer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,708,726 A - Document ID: US5708726A - Status: Granted - Kind: A - Application number: 08/515,658 - Filed: 1995-08-16 - Granted: 1998-01-13 - Earliest claimed: 1995-08-16 - Assignees: Motorola, Inc. - Inventors: Gerald Eugene Brinkley; John Michael McKee; Charles Wright Mooney; Irving Harold Holden - Web page: https://patentgrep.com/patent/US5708726A ## CPC - G08B 6/00: Tactile signalling systems, e.g. tactile personal calling systems - H04M 1/724: User interfaces specially adapted for cordless or mobile telephones - G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) ## Abstract A taut armature resonant impulse transducer (100) includes an armature (12), an electromagnetic driver (24, 26) and a magnetic motional mass (18). The armature includes upper (14, 15) and lower (16, 17) cross-coupled non-linear resonant suspension members, each including first and second non-linear springs (62, 72) connected to a stepped central region and to opposite contiguous planar perimeter regions of an eIectromagnetic driver (24, 26) which effects an alternating electromagnetic field. A first end of the second non-linear spring is positioned within a periphery defining a shape of the first non-linear spring. The magnetic motional mass (18) is suspended between the upper (14, 15) and lower (16, 17) cross-coupled non-linear resonant suspension members, and provides an alternating movement in response to the alternating electromagnetic field which is transformed through the upper (14, 15) and lower (16, 17) cross-coupled non-linear resonant suspension members and the electromagnetic driver (24, 26) into motional energy. ## Claims ### Claim 1 A taut armature, resonant impulse transducer, comprising: an electromagnetic driver for effecting an alternating electromagnetic field in response to an input signal; a magnetic motional mass having a stepped central region which includes a first termination at a first level and a second termination at a second level, said second level being lower than said first level; and an armature, including upper cross-coupled non-linear suspension members and lower cross-coupled non-linear suspension members, said cross-coupled non-linear suspension members comprising first and second non-linear springs, each having a first end and a second end utilized for terminating said first and second non-linear springs, said first end of said first non-linear spring connecting to said first termination of said magnetic motional mass and said first end of said second non-linear spring is positioned within a periphery defining a shape of said first non-linear spring and connecting to said second termination of said magnetic motional mass, and said second end of said first and second non-linear springs connecting to opposite perimeter regions of said electromagnetic driver, said magnetic motional mass is suspended between said upper cross-coupled non-linear suspension members and said lower cross-coupled non-linear suspension members, and coupled to said alternating electromagnetic field for generating an alternating movement of said magnetic motional mass in response thereto, the alternating movement of said magnetic motional mass being transformed through said upper cross-coupled non-linear suspension members and said lower cross-coupled non-linear suspension members and said electromagnetic driver into motional energy. ### Claim 2 (depends on 1) The taut armature, resonant impulse transducer according to claim 1, wherein said first and second non-linear springs comprise two curved planar beams. ### Claim 3 (depends on 2) The taut armature, resonant impulse transducer according to claim 2, wherein said two curved planar beams have a circular outer periphery and an elliptical inner periphery. ### Claim 4 (depends on 1) The taut armature, resonant impulse transducer according to claim 1, wherein said first and second non-linear springs comprise a pair of juxtaposed planar compound beams each comprising at least two independent concentric arcuate beams. ### Claim 5 (depends on 4) The taut armature, resonant impulse transducer according to claim 4, wherein said at least two independent concentric arcuate beams exhibits a substantially identical spring rate (K). ### Claim 6 (depends on 4) The taut armature, resonant impulse transducer according to claim 4, wherein said at least two independent concentric arcuate beams comprise an inner arcuate beam having a first mean dimension, and at least an outer arcuate beam having a second mean dimension, wherein said second mean dimension is greater than said first mean dimension. ### Claim 7 (depends on 6) The taut armature, resonant impulse transducer according to claim 6, wherein said inner arcuate beam and said at least an outer arcuate beam have a circular shape. ### Claim 8 (depends on 6) The taut armature, resonant impulse transducer according to claim 6, wherein said inner arcuate beam has a first medial beam width, and wherein said at least an outer arcuate beam has a second medial beam width, wherein said second medial beam width is greater than said first medial beam width. ### Claim 9 (depends on 1) The taut armature, resonant impulse transducer according to claim 1, wherein said magnetic motional mass comprises: first and second permanent magnets, each generating a permanent magnetic field having a predetermined N-S magnetic field orientation; and a magnet mount for mounting said first and second permanent magnets such that said predetermined N-S magnetic field orientation of each of said first and second permanent magnets are in opposition. ### Claim 10 (depends on 1) The taut armature, resonant impulse transducer according to claim 1, wherein said input signal is a sub-audible frequency electrical signal, and wherein the alternating movement of said magnetic motional mass is transformed through said upper cross-coupled non-linear suspension members and said lower cross-coupled non-linear suspension members and said electromagnetic driver into tactile energy. ### Claim 11 An inertial audio delivery device, comprising: a taut armature, resonant impulse transducer, comprising an electromagnetic driver for effecting an alternating electromagnetic field in response to an audible input signal, a magnetic motional mass having a stepped central region which includes a first termination at a first level and a second termination at a second level, said second level being lower than said first level, and an armature, including upper cross-coupled non-linear suspension members and lower cross-coupled non-linear suspension members, said cross-coupled non-linear suspension members comprising first and second non-linear springs, each having a first end and a second end utilized for terminating said first and second non-linear springs, said first end of said first non-linear spring connecting to said first termination of said magnetic motional mass and said first end of said second non-linear spring is positioned within a periphery defining a shape of said first non-linear spring and connecting to said second termination of said magnetic motional mass, and said second end of said first and second non-linear springs connecting to opposite perimeter regions of said electromagnetic driver, said magnetic motional mass is suspended between said upper cross-coupled non-linear suspension members and said lower cross-coupled non-linear suspension members, and coupled to said alternating electromagnetic field for generating an alternating movement of said magnetic motional mass in response thereto, the alternating movement of said magnetic motional mass being transformed through said upper cross-coupled non-linear suspension members and said lower cross-coupled non-linear suspension members and said electromagnetic driver into motional energy; and p1 a housing, for enclosing said taut armature resonant impulse transducer, for delivering acoustic energy. ### Claim 12 (depends on 11) The inertial audio delivery device according to claim 11, wherein said first and second non-linear springs comprise two curved planar beams. ### Claim 13 (depends on 12) The inertial audio delivery device according to claim 12, wherein said two curved planar beams have a circular outer periphery and an elliptical inner periphery. ### Claim 14 (depends on 11) The inertial audio delivery device according to claim 11, wherein said first and second non-linear springs comprise a pair of juxtaposed planar compound beams each comprising at least two independent concentric arcuate beams. ### Claim 15 (depends on 14) The inertial audio delivery device according to claim 14, wherein said at least two independent concentric arcuate beams exhibits a substantially identical spring rate (K). ### Claim 16 (depends on 15) The inertial audio delivery device according to claim 15, wherein said at least two independent concentric arcuate beams comprise an inner arcuate beam having a first mean dimension, and at least an outer arcuate beam having a second mean dimension, wherein said second mean dimension is greater than said first mean dimension. ### Claim 17 (depends on 16) The inertial audio delivery device according to claim 16, wherein said inner arcuate beam has a first medial beam width, and wherein said at least an outer arcuate beam has a second medial beam width, wherein said second medial beam width is greater than said first medial beam width. ### Claim 18 (depends on 11) The inertial audio delivery device according to claim 11, wherein said magnetic motional mass comprises: first and second permanent magnets, each generating a permanent magnetic field having a predetermined N-S magnetic field orientation; and a magnet mount for mounting said first and second permanent magnets such that said predetermined N-S magnetic field orientation of each of said first and second permanent magnets are in opposition.